region-info: missing Firehose service CIDR blocks for eusc-de-east-1 region

The L2 Kinesis Firehose construct fails in the `eusc-de-east-1` (THF) region because the CDK fact table is missing the required service CIDR blocks for Kinesis Firehose in the EUSC partition.

**Reproduction Steps:**
1. Use `aws-cdk-lib/aws-kinesisfirehose` L2 construct in `eusc-de-east-1` region
2. Deploy the stack
3. Deployment fails due to missing CIDR block information

**Requested Fix:**
Add the missing Kinesis Firehose service CIDR blocks for `eusc-de-east-1` region in the fact table at:
https://github.com/aws/aws-cdk/blob/183ec3537cecb73da5490836522229625d7596ac/packages/aws-cdk-lib/region-info/build-tools/fact-tables.ts#L1236

**Environment:**
- Region: eusc-de-east-1 (THF)
- Partition: aws-eusc

Start at packages/aws-cdk-lib/region-info/build-tools/fact-tables.ts near line 1236 and inspect the existing Kinesis Firehose entries for related regions and partitions. Reproduce the failure with the aws-kinesisfirehose L2 construct in eusc-de-east-1, add the missing service CIDR blocks for the aws-eusc partition, and verify deployment no longer fails due to missing CIDR information.

Written by the indexing model from the issue text.